Mark,
You:
> Please run strace on digikam.
>
> $ strace digikam
>
> and that will let us know what is going on.

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;-) shall I attach 13M of strace output?
> In my case I had an issue with FD 7 not being opened which led me to
> nepomuk.
Here, digikam seems to read from fd 7 infinitely. Attached is a part of my
strace. If I should send you more of it, feel free to ask.
> Also could I ask you to continue to cc: the bug tracking system, so we
> can keep a record of the debugging efforts.
Done.
Regards,
Dietz